David's Drawings

I have a good story of David's Drawings by Cathryn Falwell. David is African American. He was entering a new school for the first time that day. On his way to the school he saw a very nice tree. It was wintertime so the tree had no leaves, just branches. When he settled down in his classroom no one paid him any attention so he started to draw the tree he saw. suddenly one girl approached him and told him she loved his tree, but it was missing something and proceeded to add leaves. Then several children did the same thing. When the tree was finished it looked like a tree in summer, but it was winter. What do you think is the problem with David's picture?